Quick connect parameter exchange

Abstract

The startup, retrain, renegotiation quick connect or other processes of handshaking between communication systems involve the exchange of certain modulation, constellation, precoder, prefilter and other communication related information. The communication systems exchange one long information sequence including all the necessary communication information. Subsequently, the communication systems start transmitting short sequences, including an acknowledgement information portion. If one of the communication systems does not receive an acknowledgement within a predetermined time or event, that communication system may retransmit another long information sequence. After such retransmission, the retransmitting communication system may continue transmitting the long information sequences or may start transmitting the short sequences once again. Eventually, each of the communication systems should receive a long information sequence and acknowledge their receipt of such sequence.

Description

RELATED APPLICATIONS[0001]The present application is a Continuation of U.S. application Ser. No. 09 / 557,233, filed Apr. 24, 2000, now U.S. Pat. No. 6,704,399, which is a Continuation-In-Part of U.S. application Ser. Nos. 09 / 416,482 and 09 / 393,616, filed Oct. 12, 1999, now U.S. Pat. No. 6,785,371, and Sep. 10, 1999, respectively, which are both Continuation-In-Part applications of U.S. application Ser. No. 09 / 394,018, filed Sep. 10, 1999, now U.S. Pat. No. 6,768,791, which is a Continuation-In-Part application of U.S. application Ser. No. 09 / 361,842, filed Jul. 27, 1999, now U.S. Pat. No. 6,819,749, which claims the benefit of U.S. provisional application Ser. No. 60 / 128,874, filed Apr. 12, 1999. The present application also claims the benefit of U.S. provisional applications Ser. No. 60 / 167,572, filed Nov. 26, 1999. All above-mentioned applications are hereby fully incorporated by reference in the present application.FIELD OF THE INVENTION[0002]The present invention relates generall...

AI Technical Summary

Benefits of technology

The present invention provides techniques to speed up the startup and reconnection times of a data communication system that uses a modem. This is achieved by exchanging necessary parameters between the communication systems in a quick and efficient manner during the handshaking process. The use of short information sequences eliminates the delay and overhead introduced by continuous transmissions and retransmissions of long information sequences. Additionally, if a communication system does not receive an acknowledgement sequence within a predetermined time, it may retransmit another long information sequence. Overall, the quick reconnect technique reduces the reconnection time for a communication session and improves the overall efficiency of data communication.

Problems solved by technology

Such legacy modems, and downwardly compatible V.90 modems, may have an undesirably long connect or initialization time between dial-up and full rate data mode.

The startup time can be up to 30 seconds, which can be rather annoying and unattractive from the perspective of the end user, especially in light of other data communication protocols that appear to operate in an “always connected” manner.

However, many channels can only support legacy modes such as V.34.

The long initialization period associated with V.90 modems that fall back into legacy modes may be annoying and undesirable in many applications and can be a serious hindrance where a user would like to establish an immediate connection after an unanticipated disconnect.

For example, a call waiting signal may disrupt a modem connection to the extent that the modem call must either be reconnected or reinitialized.

One major time consuming portion of modem training and negotiation occurs during parameter exchanges, such as exchange of data signaling rate, preceding coefficient, spectral shaping, constellation information and etc.

The repeated transmissions of these long CP, CP′, MP and MP′ frames, including many bits of information, are indeed a tremendous overhead.

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